package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 2
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");

                if(info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }
            wareSkuDao.insert(skuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 库存解锁
     * 1）、下单成功，订单过期没有支付被系统自动取消，被用户手动取消，都要解锁库存
     * 2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚
     *      之前锁定的库存就要自动解锁
     *
     * @param vo
     * @return
     */

    @Autowired
    RabbitTemplate rabbitTemplate;


    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService detailService;

    //为某个订单锁定库存
    //一个个仓库的锁，锁一个更新一个库存锁定，
    //有一个仓库没有锁成功就会失败,默认只要是运行时异常就会回滚
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情,保存一个订单
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);


        //1、按照下单的收获地址找到一个就近仓库
        //找到每个商品在哪个仓库有库存
        //拿到每个商品的skuId和count
        List<OrderItemVo> locks = vo.getLocks();

        //先根据skuID查到有库存的仓库，返回这些仓库的id和sku的id
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            stock.setNum(item.getCount());
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;

        //锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            Integer num = hasStock.getNum();

            if (wareIds == null || wareIds.size()==0){
                //当前商品没有仓库有库存
                //抛异常之后后面的默认不会执行，直接不要else
                throw new NoStockException(skuId);
            }

            //有仓库有库存，一个个仓库的试着去锁
            //1、如果每一个商品都锁定成功，将当前的商品锁定了几件的工作记录发给模mq
            //2、锁定失败，前面保存的工作单消息就回滚了，发送出去的消息，即使要解锁记录
            // 由于数据查不到id，所以就不用解锁
            for (Long wareId : wareIds) {
                //成功返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,num);
                //当前商品锁成功
                if (count == 1) {
                skuStocked = true;
                //TODO 发消息告诉MQ锁定成功

                    //保存一个已经锁定库存的商品的详情信息
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);

                    //数据库保存已经锁定库存的商品的详情信息
                    detailService.save(entity);

                    //lockedTo是要发送到mq里面的消息，包括订单任务的id,订单中商品的详情
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());   //前面表的ID不用设置，可以直接拿到

                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    lockedTo.setDetail(stockDetailTo);

                    //convertAndSend将lockedTo发送到死信队列
                    rabbitTemplate.convertAndSend("stock-event-exchange",
                            "stock.locked",
                            lockedTo);
                    break;
                }else{
                //当前仓库，锁失败，重试下一个仓库

                }
            }

            if(skuStocked == false){
                //当前商品没有一个仓库锁成功
                throw new NoStockException(skuId);
            }
        }

        //能走到这，肯定全部都锁成功了
        //3、全部锁定成功
        return true;
    }

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;


    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){

           //库存解锁
           wareSkuDao.unlockStock(skuId,wareId,num);


           //更新库存工作单的状态,状态修改为2，解锁过后就会修改解锁状态为2
           WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
           entity.setId(taskDetailId);
           entity.setLockStatus(2);
           orderTaskDetailService.updateById(entity);
    }

    @Override
    public void releaseLockStock(WareSkuLockVo vo) {

    }

    //死信过了时间 到了接收队列后 锁定的基本信息就会被接收到
    //解锁，库存锁定失败了，库存会回滚，这种情况无需解锁
    //库存锁失败了，锁定库存就会回滚，在数据库中就查不到与锁定库存有关的信息
    //只有查得到信息才需要回滚
    @Override
    public void unlockStock(StockLockedTo to) {

        StockDetailTo detail = to.getDetail(); //订单项详情
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();

        //拿到订单解锁详情的情况
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);

        //只有查得到锁定信息才需要回滚
        //有 库存锁定成功了
        //    解锁：订单情况
        //         没有这个订单，必须解锁
        //         有这个订单，不是解锁库存
        //               订单状态 已取消：解锁库存
        //                       没取消：不能解锁
        //订单锁定详情有信息，说明库存锁成功了，需要解锁
        if(byId != null){
            //有信息，说明库存锁成功了，需要解锁
            //查到订单任务的id,再查到订单的Sn,再查订单的状态
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();

            R r = orderFeignService.getOrderStatus(orderSn);

            //传来的R状态是0，👎订单是取消状态才可以解锁库存
            if(r.getCode()==0){
                OrderVo data = r.getData(new TypeReference<OrderVo>() {});
                //1、订单掉了其他方法把自己搞炸了全部回滚了而库存却没有回滚,查到的订单数据就是空
                //2、订单被取消了
                if(data==null || data.getStatus() == 4){

                    if(byId.getLockStatus()==1){
                        //当前库存工作单状态为1,已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                        //使用手动ack
                    }
                }
            }else{
                throw new RuntimeException("远程服务失败");
                //远程feign的调用都失败了，拒绝接收消息，重新放回队列
                //异常直接上抛重新ack
            }

        }else{
            //无需解锁
            //没有信息，说明某个订单项锁失败了，全部订单项都回滚了 无需解锁
        }
    }

    //这个才是主要的库存解锁订单，
    //库存系统的第二次解锁只是补偿性，检查是不是由订单系统出错引起回滚而库存系统没回滚的异常的补偿；
    //防止订单服务卡顿，导致消息状态一直改不了，库存消息什么都不做就走了
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {

        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id).eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }



}